Core barrel



March l5, 1932. A 1 CORN'HER 1,849,345

CORE BARREL Fiied July 15, 19,29

\ @u f uw 4 l INVENTOR O\\ Runen J2 Con/wam.

Patented Mar. 15, 1932 UNITED STATES ALFRED J. CORMIER, oF BELLFLOWEECALIFORNIA CORE BARREL Application led .Tuly 15,

This invention relates to a core barrel, and the prime object of my invention is to provide a means whereby the bottom of the core barrel is closed before it leaves the bottom of the hole.

Another object is to provide a core barrel having a novel external circulating passage.

Still another object is to provide a core barrel in which a larger core is taken than in barrels heretofore in use. Y

Other objects, advantages and features of invention may appear from the accompanying drawings, the subjoined. detailed description and the appended claims.

In the drawings:

Figure 1 is a side elevation of my core barrel with parts broken away to show interior construction.

Figure 2 is a fragmental side elevation of the lower part of the inner barrel.

Figure 3 is an enlarged longitudinal sectional view of my core barrel.

Figure 4 is a sectional view taken on line 4-4 Figure 3.

Referring more particularly to the drawings, the numeral 1 indicates the inner or main barrel of the core barrel, and the usual drill pipe 2 is screwed on to the upper end of the barrel 1. A sleeve 3 surrounds the lower part of the barrel 1 and the barrel is slidable therein as will be further described. A

core cutting bit 4 is formed on the lower endA of the sleeve 3 and the usual reaming-Kside cutters 5 are also provided. A plurality of spring fingers 6 are provided in the sleeve 3, and these fingers extend to adjacent the lower end of said sleeve. They tend to spring inwardly, thus closing the bottom of the core barrel to prevent the core from moving downwardly. The fingers 6 are suitably-secured within the sleeve 3 by riveting, welding or other suitable means.

The lower end of the barrel 1 is formed with a multisided section 7, and a tapered tip 8 at the bottom thereof. The tip 8 screws into the bottom of the barrel 1 and maybe removed and replaced when it is worn. The section 7 is so formed that a spring 6 will lie along each of the faces thereof. The

1929. Serial No. 378,199.

`sleeve 3 is provided with a plurality of slots 9 in the upper endthereof,and the barrel 1 isV provided IwithV lugs 10 which'fit into the slots 9. `The purpose of. this arrangement Y is to cause the sleeve 3 to'rotate with the bar- 55v rel 1 and still enable the vbarrel to slide in the sleeve. A nut 11` surrounds the barrel 1 and screws into the'top of the sleeve 3,thus holdingv the sleeve onto the barrel and preventing its removal therefrom, by reason of the fact that the lugs 10 will engage the bottom of thenut. z

Tubes 12--12 areprovided on.` outside of thesleeve 3 and a pair o f pipes 1313 extend into the tubes `12`alnd are slidable therein. G5 The rpipes l13 screw into av pair of pipes 14-14,`vwhich pipes are secured to the sides of the barrel land extend into said barrel for the purpose 'of conducting the circulating fluid downwardly ,.alongthe sides of thebarrel l and'sleeve'. The nut 11 is notched as at 15 to receive the pipes 13 and the pipes also serve to lock the nut and prevent accidental rotation thereof. A check valve 16 is provided inthe barrel 1 adjacent the upper end 75 thereof for the purpose of relieving any pressure-above the core, all of which is usual in core barrels.

In operation the core barrel is lowered into the hole and when the bottom is reached the 30 weighty of drill pipe is sufficient to force the barrel 1 downwardly to the position shown in Figure 3. In this position the lingers 6 are forced outwardly against the walls of the sleeve 3 and are out of the way of the core. 85. The core is now taken'in the usual manner and when the drill pipe is pulled upwardly for the purpose of removing the corel barrel from the hole, the barrel lwill slide upwardly, thus permitting the lingers 6 to contract 9e around the bottom of the core, and the core will be held against downward movement before the sleeve 3 leaves the bottom of the hole.

Having described my invention, I claim: ,.QF

1. A core barrel comprising an inner barrel q section, a sleeve slidably mounted over the lower end of said barrel section, a plurality of spring fingers in said sleeve, said barrel section being adapted to engage said spring "les lingers to force them outwardly when a core is being taken, lugs on said inner barrel, said sleeve having longitudinally extending grooves formed therein, in which said lugs are 5 adapted to slide, and a nut screwed into the top of said sleeve, said nut surrounding the inner barrel. f

2. A core barrel Comprising an inner barnel section, a sleeve slidably mounted over the lower end ofsaid barrel section, a plurality of spring fingers in said sleeve, said barrelseo- Y tion being adapted to engage said spring lingers to force them outwardly Whena core is being taken, a core cutter on the lower end of Said sleeve, said inner barrelbeingformed With a multi-sided sectionl against which said spring lingers are adapted to lay, and a tapered tip on the lower end of said inner barrel.

, V3. LA core barrel comprising an inner barrel section, a sleeve slidably mounted over the lower end of said barrel section, a plurality of spring lingers in said sleeve, said barrel section being adapted to engage said spring fingersto fforee them outwardly when a core is being taken, a Core cutter on the lower end of said sleeve, said inner barrel being formed with a multi-sided section against which said springflingers are adapted to lay, and a taperecl tip on the lower end of said inner bar` rel, a plurality of lugs on said inner barrel, said sleeve having grooves therein in which the lugs t, and a nut screwed into the top of the sleeve around said inner barrel.

In testimony whereof I afIiX my signature.

ALFRED J. CORMIER. 

